halo 2 won' t load on my x-box

i've been have'n problems with halo2 i downloaded it burn' and install'd it on my xbox but when it loads up i get a dirty disk error after the mircosoft screen. i've been look for and answer for 2 days now but can't seem to find one. is there a hd fix or am i just doing something wrong? can somebody help me i'm pretty new to this stuff
thanx

i really don't trust those game downloads. they are not always uploaded correctly. you should just go and borrow someones halo 2 or go and rent the game. then ftp or send it straight to your xbox hd if that is what you prefer.